Damper-operating motor.



E. H. WHITE.

DAMPER OPERATiNG MOTOR. APPucAuoN f|LED1AN,1o.191e.

Patented Apr. 8, 1919.

EVERETT H. WHITE, or sT. PAUL, lirrrrirnsorn.I

DAMPER-OPERATIN G MOTOR.

Specification of Letters Patent.

Patented Apr. s, 1919.

Application mea January 1o, 191s. serial No. 71349.

To all whom t may concern:

Be it known that I, EVERETT H. WHITE, a citizen of the UnitedStates,'residing at St. Paul, in the county of Ramsey and State ofMinnesota, have invented certain new and useful Improvements inDamper-Operating Motors, of which the following is a specification.

My invention relates to damper operating motors of the form in which anelectric motor is used to operate a shaft, which shaft may be instantlystopped by a catch controlled through an electromagnetl when said shaftarrives at certain predetermined positions. The object of the inventionis to provide switching means which shunt the motor field and give themagnet the full electric motive force of the battery, an'd to provide aspiing connection in the shaft between the catch elements and thedriving elements so that in releasing t-he catch no force is exertedbetween the catch elements,

making the catch certain. A further object is to provide circuitbreakers for stopping the motor in various positions of the dampers andto provide circuits for causing certain of the circuit breakers tooperate combinedly to make the damper-operating arms to travel a minimumdistance in reaching the predetermined position. v

The full objects and advantages of my invention will appear inconnection with the detailed description thereof andare particularlypointed out in the claims.

In the drawings, illustrating the application of my invention in oneform,-

Figure 1 is a plan view of my improved damper-operating motor with someparts cut away. Fig. 2 is a section taken substan` tially on line 2 2 ofFig. 1. Fig. 3 is a section of a portion of the device taken on line 3 3of Fig. 1. Fig. 4 is a wiring diagram in which the circuit breakers arerepresented by a sectional view taken on line 4-4 of Fig'. 1.

The frame of my device consistsl of two parallel plates 10 and 11 heldspaced by and secured to four transverse bars l2, 13, 14, 15 located atthe corners of said plates. At one end of this frame is located anelectric motor 16 which tits snugly between the two plates 10 and 11 andwhich is secured to plate 10 by-screws 17 which fasten directly lnto themotor iield frame. The drive Shaft 18 of motor 16 is provided with apinion 19 which meshes with a gear 20 fast on a shaft 2l Journaled inbrackets 23 and y22 secured to the frame plate l0. Gear 20 is connectedby means of a coil spring 24 surrounding the shaft 21 to a worm gear 25,so that driving connection between the two said gears takes placethrough the spring 24, it being necessary to wind said spring a certainamount before the driven gear starts to rotate. Wormgear 25 meshes witha worm wheel 26 fast on a transverse shaft 27 journaled in the framemembers 10 and 11 and extending out beyond the sameon both sides. At theextreme ends of shaft 27 are positioned arms 28 and 29 extending outVoppositely to each other, which arms 4may be attached to the dampers ofa boiler or furnace to open and close the same in the usual manner.

In order to stop the action of the arms 28 .and 29 at certain fixedpredetermined positions, I employ the device best shown Figs. 2 and 3.Integral with worm 25 is a sleeve 3() which has secured to it a disk`31. Sleeve 3() with the parts integral therewith, as before stated, isloosely mounted on shaft 2l and is retained against longitudinal motionby collars 32 and 33 secured to said shaft. Disk 31 is provided on itsperiphery with a notch 34 which may be engaged by a catch 35 formed atthe end of the armature 36 of an electromagnet 37. The armature ispivoted in a casting| 38, and the electromagnet 37 is attached to abracket 39, both of which aire secured to the frame member 10. The partsare so arranged that when the electromagnet 37 draws up its armature 36the catch 35 is disengaged from the notch 34 and the disk 31 isreleased. Armature 36 carries insulated therefrom one member 40 of acircuit breaker, thefunction of which will later be explained. TheVother member 41 of this circuit breaker is secured to an insulatingblock 42 attached to the frame member 10.A The exact shapes of thesemembers areelearly shownin Fig. 2.

The 'c'ircuit breakers used for stopping inotor 16 when arms 28 and 29arrive'at'the requisite positions are best shown in Figs. 1, 2 and 4.Attached to plate 11 in the vicinity of shaft 27, by screws 64, is aplate 43 of insulating material. To correspond to the positions whichthe arms 28 and 29 are desired to take are located corresponding contactfingers 44, 45, 46, 47, 48 and 49 radially disposed upon plate 43v aboutshaftv iusl pin 52-as the shaft 27 rotates is to raise the individualfingers from their contact points, as shown in Fig. 1, and break thecircuits connected therewith. Plate 43 is provided with four bindingposts 59, 60, 61 and 62 by which the machine is connected to a suitablethermostat and the parts on plate 43 extending through to the back ofthe same are insulated from the frame member 11 by a sheet of insulatingmaterial 63.'

Thewiring diagram is shown in Figi 4. Contact points 53, 58, 57, and 56are all donnected together and to a lead 65 which goes to one terminalof the motor armature 66. Contact point-54 is connected by a lead 67 tofinger 49, and contact point 55 is connected by a lead 68 to finger 48.The fingers 44, 45, 46, 47 are respectively connected by leads 69, 70,71 and 72 to binding posts 59, 60, 61 and 62. Binding posts 59, 60, 61and 62 are connected through lines 73, 74, 75 and 76 with the fixedcontact members 77,

78, 79 and 80 of a suitable thermostat 81. The movable contact member 82of the thermostat 81 is connected through-a line 83 with' a battery by alead 85 with the other terminal of the armature 66.

v The action of the device is as follows. the normal position, when pin52 is at rest, it lifts one of fingers 45, 46, etc., and opens thecircuit 'n which that finger is placed. At the sam lme member 82 closesthe same circuit at thel'thermostat and all the remaining circuits arehence broken atl the thermostat. This means that all of the circuits areopen but as soon as member 82 shifts, one of the other circuits isclosed and is set in action. It continues un motor pin 52 breaks thatcircuit by lifting the corre-` sponding contact finger, and then actionlceases. In the arrangement shown, when finger 47 is lifted thedraft dooris closed; when finger,A 48 is ,lifted the draft door is one-quarteropen; and when fingers 49.and

44 are successively opened the draft door becomes one-half and fullopen. It hence becomes evident that the door also takes the guarter andhalf open position when the ngers 46 and 45 are lifted.' For this reasonthe circuit breakers 45--54 and 49-58 are connected in series, and alsothe circuit camportions 50 which overlap a lingly 84 which, in turn,connects either of the two circuit breakers for one position of thedraft door be engaged by pin 52 the draft door will be correspondopenedand the arms will travel the minimum amount in arriving at the desiredposition.

It would not be possible to stop the motor soon enough when the" circuithas been broken, and for that reason the notched disk and catcharrangement, with the releasing magnet, has beenv provided. Againreferring to Fig. 4, the field 86v of the motor 16 and the electromagnet37 are connected in' series by a lead 87 and are shunted across thearmature terminals by leads 88 and 89. The field 86 is normallyshortcircuited by a circuit 90 connected in at the leads 88 and 87 andcontains the circuit breaker 40-41 operated by the electromagnetarmature 36. When at rest circuit 83-65 is open and the circuit 90 isclosed. Upon closing circuit 8,3-65 current is supplied to the armature60 of thel motor 16 and to the electromagnet 37, the field 86being'short circuited by the shunting circuit 90 and hence substantiallydeprived of current. The armature 36 is hence raised and the catch 35disengaged from the notch 34 in disk 31 so that the same is free torotate. Not until said catch is completely withdrawn is the switch 40-41opened to energize the field 86. Thus the whole electromotive force ofthe battery is impressed upon the magnet 37 at the time it commences tooperate, and when the same is inl its drawn up position theelectromotive force is impressed across both the motor field and theelectromagnet in series. This gives sufiicient current to maintain themagnet raised and to operate the motor, When any of the circuit breakerson plate 43 are opened the circuit 83--65 is broken and both the motor16 and magnet 37 are deprived of current. Armature 36, which is normallyheld downward by a spring 91, immediately moves downward and catch 35engages notch 34 in disk 31 as soon as it comes around andinstantaneously stops sleeve 30 together with gears 25 and 26. The motorarmature, however, has considerable momentum, due to its high velocity,and spring 24 serves to absorb the "energy of the same and hence windsup.

time and energy consumed in rotating the operating arms is alsolessened, thus rendering the device more efficient.

I claim:

1. A damper operating device comprising a main shaft, a Worm gear onsaid shaft, a countershaft, a sleeve rotatably mounted on saidcountershaft, a worm integral with said sleeve and driving said wormWheel, a gear fixed on said countershaft, a coil spring surrounding saidcountershaft and attached to said gear and said worm, a motor drivingsaid gear, a notched disk integral with said sleeve, and means tosimultaneously stop the disk and deprive the motor of current.

2. A damper controlling device comprising a shaft, a plurality of fixedContact members radially positioned about the shaft, a correspondingnumber of yielding contact members positioned over and each normally incontact with the fixed contact member which is correlated therewith, anarm on said shaft adapted to raise said yielding contact members, meansfor driving the shaft in one direction, and circuits connecting saidcontact members, some of said contact members operating in series toopen the circuits atv certain positions of the damper from either of twopositions of the shaft.

3. A damper controlling device comprising a shaft, a plurality of fixedcontact members radially positioned about the shaft, a correspondingnumber of yielding contact members positioned over and each normally incontact with the xed contact member which is correlated therewith, amotor circuit for operating said shaft, an arm on said shaft adapted toraise said yielding contact members, some of said fixed contact membersbeing connected together and to one line of said motor circuit, a numberof circuits connecting some of said yielding contact memberscorresponding to said last-named fixed members, to the remaining fixedContact members, and circuits connecting the remaining yielding contactmembers and the other line of the motor circuit with a regulator.

4. A damper controlling device comprising a thermostat, an electricmotor and a damper operating shaft adapted to be ro' tated by saidmotor, a plurality of fixed contact members radially positioned aboutsaid shaft, a corresponding number of yielding contact memberspositioned over and normally in Contact with the xed contact memberwhich is correlated therewith, an arm on said shaft adapted to raisesaid yielding contact members, some of said fixed contact members beingconnected together and to one terminal of the motor armature, a numberof circuits connecting some of said yield ing contact memberscorresponding to said last named fixed members tothe remaining fixedcontact members, circuits connecting the remaining yielding contactmembers to corresponding fixed contact members of the thermostat, and acircuit connecting the movable member of the thermostat through a sourceof electrical energy to the other terminal of the motor armature.

5. A damper operating device comprising a shaft, an operating circuit, amotor for driving said shaft, the armature of said motor being connectedacross said circuit, a catch for quickly stopping said shaft, anelectromagnet for releasing said catch, said electromagnet and the fieldof said motor being connected in series across said line, a shortcircuit including a switch shunting said field, said switchbeing-operable from said electromagnet so that when said catch 1sengaged with said shaft said short circuit is closed and the motorrendered inoperable.

6. A damper operating device comprising a shaft, a motor driving saidshaft, a catch for quickly stopping said shaft, an electromagnet fordisengaging the catch from the shaft, and electrically-operated meansfor impressing the total voltage upon the electromagnet when startingthe device and for reducing the same when said catch has been released.

In testimony whereof I affix my signature in presence of two witnesses.

EVERETT H. WHITE.

Witnesses:

F. A. IVI-IITELEY, H. A. BOWMAN.

